Pyridinecarboxamide or trimethoxybenzamide compounds derived from nitrogenous lipids, pharmaceutical compositions containing same which possess anti-convalsive and anti-epileptic properties

ABSTRACT

Organic amide compounds of the formula  &lt;IMAGE&gt;  wherein R1-CO is a residue of a carboxylic acid with the proviso that the carboxylic acid is not a natural fatty acid normally bound to nitrogen of nitrogenous lipids, R2 is a hydrogen atom, a C1-7 alkyl group, or a C4-7 cycloalkyl group, and R3-N is a residue of a nitrogenous lipid. The compounds are useful in increasing or stimulating the in vivo biological activity of in vitro biologically active carboxylic acids.

This application is a continuation of copending application Ser. No. 404,706, filed on Aug. 3, 1982, now abandoned.

BACKGROUND AND FIELD OF THE INVENTION

The present invention relates to novel organic amide compounds, procedures for preparing the compounds, pharmaceutical compositions containing the same and methods for using the compounds. These novel organic amides are primarily comprised of a carboxylic acid moiety and a nitrogenous lipid moiety.

Numerous compounds are known to be active in vitro and yet exhibit little or no activity in vivo. In particular, numerous carboxylic acids are known to be important in the actions of the peripheral and central nervous systems and are active in vitro but are either non-active or only slightly active in vivo. Gamma-aminobutyric acid (GABA), for example, is known to be active on the central nervous system in vitro and has been suggested as a possible inhibitory transmittor (Louis S. Goodman and Alfred Gilman, The Pharmacological Basis of Therapeutics, 4th Ed., p. 429 (1970)). However, GABA has been found to be ineffective when administered in vivo as measured by convulsion tests in mice.

The present inventors have found that compounds of the formula I, prepared by combining a carboxylic acid, such as GABA, with a nitrogenous lipid, such as a phospholipid or sphingosine, provide amide compounds which are active in vivo, exhibiting activities far superior to that of the corresponding carboxylic acid or lipid compounds administered alone. For example, the amide of GABA with a sphingosine provides a compound which is far more active in vivo than is GABA alone. Similarly, lysergic acid, dihydrolysergic acid and isolysergic acid are essentially inactive when administered alone, but when combined with a sphingosine provide compounds of the formula I which have significant in vivo activity as measured by hypoprolactinemic effects in rats.

The significantly improved pharmacological properties of the compounds of formula I are thought to result from the ability of these compounds to penetrate the hematoencephalic barrier and/or reach the peripheral organs far better than the carboxylic acid compounds alone. This ability of the compounds of the present invention favors the interaction between the biologically active compound, such as the carboxylic acid, and the situs of the specific interactions present in the membranes.

Hence, the compounds of the present invention are useful for enhancing or increasing the in vivo biological activity of in vitro biologically active carboxylic acids as well as stimulating the in vivo biological activity of in vitro biologically active carboxylic acids which have little or no in vivo activity.

OBJECTS AND SUMMARY OF THE INVENTION

It is another object of the present invention to provide compounds which permit the in vivo activity of other compounds which are known to be biologically active in vitro.

It is a further object of the present invention to provide a process for preparing the novel amide compounds.

It is still another object of the present invention to provide methods for using the compounds of the present invention as therapeutic agents.

It is a still further object of the present invention to provide pharmaceutical compositions which comprise at least one of the novel amide compounds as an active ingredient.

These and further objects of the present invention are accomplished by providing the novel amide compounds of formula I and pharmaceutic compositions containing the same. These amide compounds comprise a carboxylic acid moiety and a nitrogenous lipid moiety and are pharmacologically active in vivo due to the activity of the corresponding carboxylic acid but exhibit activity far superior than results from in vivo administration of the carboxylic acid alone.

DETAILED DESCRIPTION OF THE INVENTION

The novel organic amide compounds of the present invention are represented by the formula I ##STR2## wherein R₁ --CO is a residue of an organic carboxylic acid which has a pharmaceutical or biological activity with the proviso that the carboxylic acid is not a natural fatty acid normally bound to nitrogen of nitrogenous lipids, R₂ is a hydrogen atom or one of a group of hydrocarbons and NR₃ is a residue derived from a nitrogenous lipid. Natural fatty acids normally bound to nitrogen in nitrogenous lipids are described in, for example, Wiegandt, Adv. in Lipid Res., Vol. 9, pp. 249-288, Ed. by Paoletti and Kritchezsky (Academic Press, 1971) and Ansell and Hawthorne, Phospholipids, Biochem. Biophys. Acta. Library, Vol. 3, pp. 420-425 (Elsevier Pub. Co., 1964).

The R₁ --COOH acids which give rise to the R₁ --CO residue are primarily those acids which are fundamentally important to the peripheral and central nervous systems, such as lysergic, isolysergic, dihydrolysergic, 2-bromolysergic, 2-bromo-dihydrolysergic, 1-methyllysergic, 1-methyldihydrolysergic, 1-methyl-2-bromo-lysergic, 1-methyl-2-bromodihydrolysergic, gamma-aminobutyric, valproic (2-propylpentanoic), trimethoxybenzoic, nicotinic, isonicotinic, picolinic and theophyllineacetic acids. These acids have the common pharmaceutical characteristic of being active in vitro but non-active or only slightly active in vivo.

R₂ may be a hydrogen atom or a hydrocarbon, especially a saturated aliphatic hydrocarbon or a saturated cycloaliphatic hydrocarbon group; for example an alkyl having from 1 to 7 carbon atoms such as butyl, isobutyl, tertiarybutyl, propyl, isopropyl, ethyl, and methyl or a cycloalkyl having from 4 to 7 carbon atoms, such as cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.

The --N--R₃ residue is derived from a nitrogenous lipid, especially from phospholipids and sphingolipids. Phospholipids, natural products that can be extracted from bovine brain tissue, are chemically derived from L-α-glycerophosphoric acid. (Lees, M. B., Met. Enzymol, Vol. 3, pp. 328-345 (1957); Bigon et al, G. Brit. J. Pharmacol., Vol. 67, pp. 611-619 (1979); Spanner, Form and Function of Phopholipids, Ed. by Ansell et al, Biochem, Biophys. Acta. Library, Vol. 3, pp. 43-65 (1973)). The two major phospholipid groups which are utilized are the phosphatidylethanolamines (II) and the phosphatidylserines (III) represented by the following structures: ##STR3## wherein R and R' represent a hydrogen atom or the residue of an organic carboxylic acid, especially, the residue or a saturated or unsaturated fatty acid.

Sphingolipids are natural products extracted, in particular, from animals and vegatables and contain an amino-alcohol moiety (Dawson, Form and Function of Phospholipids, Ed. by Ansell et al, Biochem. Biophys. Acta. Library, Vol. 3, pp. 104-105 (1973); Kaller, Biochem. Zeitschrift, Vol. 334, pp. 451-456 (1961); Sweeley et al, J. Lipid, Res., Vol. 1, pp. 40-47 (1959); Radin, Lipids, Vol. 9, pp. 358-360 (1979)). Especially preferred sphingosines are those having an average of 12 to 22 carbon atoms.

The sphingolipid derivatives which permit the preparation of the compounds (I) of the present invention contain a sphingosinic residue and contain a free sphingosine --NH₂ group. Principally these are:

Sphingosine represented by the formula: ##STR4## wherein n may be from 6 to 16,

Dihydrosphingosine represented by the formula: ##STR5## wherein n may be from 8 to 18,

Psychosine or galactosylsphingosine represented by the formula: ##STR6## wherein n may be from 6 to 16,

Dihydropsychosine represented by the formula: ##STR7## wherein n may be from 8 to 18,

Phosphorylcholine sphingosine or lisosphingomyelins represented by the formula: ##STR8## wherein n may be from 6 to 16,

Phosphorylcholine-dihydrosphingosine, or lisodihydrosphingomyelins represented by the formula: ##STR9## wherein n may be from 8 to 18,

Phytosphingosine represented by the formula: ##STR10## wherein n may be from 11 to 15, and all other sphingolipids which through hydrolysis are capable of releasing an amine (--NH₂) group, such as is indicated below by the sphingomyeline formula XI: ##STR11##

Preparation Procedures

The organic amides (I) according to the present invention can be prepared according to a variety of preparation methods under conditions which prevent the esterification of the free hydroxyl acid. Of all the methods which have proved to be particularly appropriate, the following are most preferred.

1. The reaction between the R₁ CON₃ azides (corresponding to the R₁ --COOH acid) and the nitrogenous lipidic derivatives. The preparation of the R₁ CON₃ azides can be realized by utilizing one of the known methods.

2. The acylimidazole preparation method comprising reacting the R₁ COOH acid with N, N'-carboxyldiimidazole, followed by the reaction of the thus produced acylimidazole with the nitrogenous lipid.

3. The mixed anhydride preparation method comprising reacting the R₁ COOH acid and trifluoroacetic acid anhydride to form a mixed anhydride and then reacting the mixed anhydride with the nitrogenous lipid.

4. Preparing the acid chloride of the R₁ COOH acid followed by reacting the acid chloride with the nitrogenous lipid.

5. Direct reaction between the R₁ COOH acid and the nitrogenous lipid in the presence of a carbodiimide (for example dicyclohexylcarbodiimide, benzylisopropylcarbodiimide or benzylethylcarbodiimide) or another substance similar to 1-hydroxybenzotriazole.

6. Direct condensation from heating from R₁ COOH acid with the nitrogenous lipidic derivatives.

7. Direct reaction between the methyl ester of the R₁ COOH acid and the nitrogenous lipidic derivative; this reaction is favored by heating.

8. Preparation of an ester by the reaction between an R₁ COOH acid and a phenol (for example, paranitrophenol) followed by the reaction of the ester with the nitrogenous lipid. The ester preparation between the acid and a phenol can be realized by using one of the known methods.

In the preparation of the products described in formula (I) derived from gamma-aminobutyric acid, the method preferably used is that consisting of the initial preparation of a gamma-aminobutyric derivative where the amine group is attached to a protective group, as for example, a phthaloyl or benzyloxycarbonyl group. The derivative thus prepared is then further condensed with the nitrogenous lipid using one of the reactions previously described. The protective group is then eliminated by means of an appropriate reaction and the product (I) is thus obtained. For example, if the protective group is phthaloyl, this group could be eliminated by hydrazinalysis.

The compounds of formula I, wherein the R₁ --COOH acid contains a basic group (for example, gamma-aminobutyric, nicotinic, lysergic or dihydrolysergic acid), can be salified with therapeutically used acids such as: hydrochloric, hydrobromic, methanesulphonic and malic acids.

As described above, according to the present invention, numerous compounds, particularly carboxylic acids, can be combined with nitrogenous lipids to produce amide compounds which are pharmaceutically active in vivo. Although not limiting, the following examples illustrate the products, preparation procedures and pharmaceutical preparations of the present invention.

EXAMPLE 1 Product 1

Gamma-aminobutyrylsphingosine amides of the formula: ##STR12##

a. A gamma-phthalmid-butyryl-sphingosine-amide (Product 1a) is prepared as follows: 5.7 g of sphingosine (obtained from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 50 ml of absolute ethanol. 8.9 g of the para-nitrophenylester of gamma-phthalmidbutyric acid (prepared according to: J. Org. Chem. 27, 684-696, 1962) are added to the solution.

The solution is then heated and left to precipitate for 2 hours and the solvent is vacuum separated. The residue is mixed with 500 ml of a methylene chloride ethanol mixture (4:1). The organic solution is washed with an aqueous solution of sodium carbonate and then with water. The organic solution is dried on sodium sulphate, filtered and the solvent is then vacuum separated.

The residue crystallizes from methylene chloride-n-hexane, M.P. 97° C., yield 7.3 g.

Thin layer chromatography (silica gel) using a eluent mixture of methylene chloride: ethyl acetate: methanol, 70:30:10, indicates that it is a single compound with Rf of 0.4.

Elementary analysis gives the following results (%): C 70.20; H 8.94; N 5.61. For C₃₀ H₄₆ N₂ O₄, theoretical % calculated is-- CC 70.00; H 9.01; N 5.44.

b. 5.14 g of the gamma-phthalamid-butyryl sphingosine-amide (Product 1a) are treated with 30 ml of absolute ethanol; 20 ml of an ethanolic solution of 1 Molar hydrazine are added and heated and allowed to precipitate for 2 hrs. The solvent is then evaporated in a vacuum and 50 ml of acetic acid (2 Normal) is added to the residue and heated for 10 minutes at 50° C. The mixture is left to cool to room temperature and filtered. The filtered solution is concentrated in vacuum and a water solution of NaOH (2N) until a clearly alkaline pH is obtained.

The aqueous phase is extracted with a mixture of methylene chloride: ethanol (4:1). The organic solution is dried on sodium sulphate, which is filtered and evaporated. The residue crystallizes from tertiarybutylmethyl ether, and gamma-amino-butyryl-sphingosine amides (Product 1) M.P. 87° C., are thus obtained (yield 3.1 g).

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water:ammonia concentrated aqueous solution (70:35:5:1) indicates that the Product 1 is a single compound with Rf of 0.16.

Elementary analysis gives the following results (%): C 68.56; H 11.50; N 7.37. For C₂₂ H₄₄ N₂ O₃, theoretical % calculated is-- C 68.70; H 11.53; N 7.28.

EXAMPLE 2 Products 2.1 and 2.2

Isolisergylsphingosine amides of the formula: ##STR13## and lysergylsphingosine amides, an isomer from the formula 2.1, of the formula: ##STR14## 6.7 g of D-lysergic acid are treated with 400 ml of dimethylformamide (DMF) (this reaction is conducted taking care to work away from light); the lysergic acid gradually forms a solution. 4.45 g of N,N'-carbonyl diimidazole dissolved in 125 ml of DMF are added to the solution and kept at room temperature for 2 hours. 8.25 g of sphingosine (obtained from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are added and the mixture is maintained at room temperature for 24 hours.

DMF is evaporated in vacuum and the residue is treated with 1000 ml of ethyl acetate, the suspension is filtered and the organic solution washed with 5M of ammonia and then with water. The organic solution is dried on sodium sulphate, and then filtered and evaporated, thus obtaining a residue.

The residue is then chromatographically fractionated, separating the two compounds: Product 2.1; Product 2.2.

a. Product 2.1-Isolysergylsphingosine-amide

Chromatography on silica gel plates using an eluent mixture of ethyl acetate:methanol, 80:20, indicates that it is a single compound with Rf 0.74. Evaluation of the specific rotating power is carried out in methanol solution (1%) using a ldm polarimetric tube--result is (α)_(D) =+235°.

Elementary analysis gives the following results: C 74.16; H 9.55; N 7.78. For C₃₄ H₅₁ N₃ O₃ % calculated is-- C 74.27; H 9.35; N 7.64.

b. Product 2.2-Lysergylsphingosine-amide

(crystallizes from acetone, M.P. 139° C.)

Chromatography on silica gel plate using an eluent mixture of ethyl acetate:methanol, 80:20, indicates that it is a single compound with Rf 0.30. Evaluation of the specific rotary power is carried out in 1% chloroform using a 1 dm polarimetric tube-result is (α)_(D) =+3.

Elementary analysis gives the following results (%): C 74.10; H 9.42; N 7.80. For C₃₄ H₅₁ N₃ O₃ theoretical % calculated is-- C 74.27; H 9.35; N 7.64.

EXAMPLE 3 Product 3

a. Dihydrolysergylsphingosine amide of the formula: ##STR15## 2.7 g of dihydrolysergic acid (prepared from catalytic hydrogenation of the lysergic acid) and 2.7 g of 1-hydroxybenzotriazole are added to 100 ml of chloroform. The mixture, under continual agitation, is brought to 30° C., after which 3 g of sphingosine (obtained from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) and 2 g of dicyclohexylcarbodiimide are added.

The mixture is heated and allowed to precipitate for 1 hour, brought to room temperature and then 25 ml of ethanol are added.

The organic solution is washed with 5M ammonia and then with water. The organic solution is vacuum dried, thus obtaining a residue and solubilized in 30 ml of methanol.

The methanolic solution is brought to 0°, thus precipitating the dicyclohexylurea; the suspension is filtered and the solvent is eliminated from the filtered substance by vacuum. The residue is solubilized by heating with 45 ml of acetone. While cooling, the dihydrolysergylsphingosine amides crystallize, M.P. 206° C., yield 3.8 g.

Thin layer chromatography (silica gel) using an eluent mixture of methylene chloride:ethyl acetate:methanol 60:30:15, indicates that it is a single compound with Rf of 0.25.

Evaluation of the specific rotary power is carried out in a 2% methanol solution using a 1 dm polarimetric tube--result is (α)_(D) =-63°.

Elementary analysis gives the following results (%): C 73.85; H 9.72; N 7.34. For C₃₄ H₅₃ N₃ O₃ theoretical % calculated is-- C 74.00; H 9.68; N 7.26.

b. The preparation of the salt with methane sulphonic acid from the dihydrolysergyl sphingosine amide is as follows: 1 g of dihydrolysergyl sphingosine amide is dissolved in 50 ml of acetone, and 0.18 g of methane sulphonic acid are added. The solution is then concentrated in small volumes, crystallizing the salt of the dihydrolysergylsphingosine amides with methane sulphonic acid.

Evaluation of the specific rotary power is carried out in a methanol solution of 2% using 1 dm polarimetric tube--result is (α)_(D) =-41.5°.

EXAMPLE 4 Product 4

Valproylsphingosine amide of the formula: ##STR16## 11.5 g of sphingosine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 1000 ml of absolute ethanol. To this solution 13.1 g of the para-nitrophenylester of valproic acid (prepared according to: Chim. Ther. 3, (5), 336-42, 1968) is added.

This solution is then treated in the manner described in Example 5. The residue is crystallized by tertiarybutyl methyl ether, M.P. 118° C., yield 14.9 g.

Thin layer chromatography (silica gel) utilizing an eluent mixture formed from: methylene chloride (70); ethyl acetate (30); methanol (10); indicates that it is a single compound with Rf 0.85.

Elementary analysis gives the following results (%): C 73.30; H 12.25; N 3.11. For C₂₆ H₅₁ NO₃ theoretical % calculated is-- C 73.36; H 12.08; N 3.29.

EXAMPLE 5 Product 5

3,4,5-Trimethoxybenzoylsphingosine amide of the formula: ##STR17## 5 g of sphingosine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 500 ml of absolute ethanol. To this solution 7.35 g of a p-nitrophenylester of the 3,4,5-trimethoxybenzoic acid are added (prepared according to: Anales Asoc. Guim. Argentina 26, 51-56, 1938). This mixture is heated and left to precipitate for 2 hours and the solvent is vacuum separated. The residue is mixed with 500 ml of a methylene chloride:ethanol mixture (4:1). The organic solution is washed with an aqueous solution of sodium carbonate and then with water. The organic solution is dried on sodium sulphate, filtered and the solvent is then vacuum separated. The residue crystallizes from tertiarybutyl methyl ether, M.P. 130° C., yield 7.3 g.

Thin layer chromatography (silica gel) using a eluent mixture formed by methylene chloride:ethyl acetate:methanol (40:30:10) indicates that it is a single compound with Rf of 0.5.

Elementary analysis gives the following results (%): C 68.01; H 9.78; N 2.67. For C₂₈ H₄₇ NO₆ theoretical % is calculated is-- C 68.12; H 9.60; N 2.84.

EXAMPLE 6 Product 6

Theophyllinacetylsphingosine amide of the formula: ##STR18## 6 g of sphingosine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 500 ml of absolute ethanol. To this solution are added 9.5 g of a p-nitrophenylester of theophyllineacetic acid (prepared according to: Annalen (1976) 860-75). The same procedure as described in Example 5 is then followed.

The residue crystallizes from methanol, M.P. 189° C., yield 8.5 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by methylene chloride:ethyl acetate;methanol (60:30:20), indicates that it is a single compound with Rf of 0.6.

Elementary analysis gives the following results (%): C 62.31; H 8.70; N 13.30. For C₂₇ H₄₅ N₅ O₅ theoretical % calculated is-- C 62.40; H 8.73; N 13.48.

EXAMPLE 7 Product 7

Nicotinylsphingosine amide of the formula: ##STR19## 5 g of sphingosine (obtained from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 500 ml of absolute ethanol. 5.5 g of p-nitrophenylester of the nicotinic acid are added to the solution (prepared according to: J. Chem. Soc. B. (1971) 2401-6). The same procedure as described in Example 5 is then followed.

The residue crystallizes from tertiarybutyl methyl ether, M.P. 105° C., yield 6.7 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by methylene chloride:ethyl acetate:methanol (70:30:10) indicates that it is a single compound with an Rf of 0.23.

Elementary analysis gives the following results (%): C 71.12; H 9.78; N 6.70. For C₂₄ H₄₀ N₂ O₂ theoretical % calculated is-- C 71.24; H 9.97; N 6.92.

EXAMPLE 8 Product 8

3,4,5-Trimethoxybenzoylpsycosine amide of the formula ##STR20## 5 g of psycosine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 4.8 g of the p-nitrophenylester of trimethoxybenzoic acid in an ethanolic solution (see Example 5). The same procedure as described in Example b 5 is then followed.

The residue crystallizes from ethanol-acetone, M.P. 135° C., yield 6.7 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (110:40:6) indicates that it is a single compound with Rf of 0.85.

Elementary analysis gives the following results (%): C 62.02; H 8.54; N 1.99. For C₃₄ H₅₇ NO₁₁ theoretical % calculated is-- C 62.27; H 8.76; N 2.14.

EXAMPLE 9 Product 9

Nicotinylpsycosine amide of the formula ##STR21## 5 g of psycosine (obtained from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 3.5 g of the p-nitrophenylester of nicotinic acid in an ethanolic solution (see Example 7). The same procedure as described in Example 5 is then followed.

The residue crystallizes from acetone, M.P. 140° C., yield 6.7 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (110:40:6), indicates that it is a single compound with an Rf of 0.80.

Elementary analysis gives the following results (%): C 63.30; H 8.75; N 4.80. For C₃₀ H₅₀ N₂ O₈, theoretical % calculated is-- C 63.58; H 8.80; N 4.94.

EXAMPLE 10 Product 10

3,4,5-Trimethoxybenzoyl-sphingosinephosphorylcholine amide of the formula ##STR22## 5 g of sphingosinephosphorylcholine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 4.6 g of a p-nitrophenylester of the 3,4,5-trimethoxybenzoic acid in an ethanolic solution (see Example 5).

The same procedure as described in Example 5 is then followed. The residue crystallizes from tertiarybutyl methyl ether, M.P. 127° C., yield 6.1 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (60:35:8), indicates that it is a single compound with an Rf of 0.25.

EXAMPLE 11 Product 11

3,4,5-Trimethoxybenzoyl-phosphatidylserine amide of the formula ##STR23## 5 g of phosphatidylserine (taken from the phospholipids present in the bovine brain and in which the groups R and R' are mainly stearic, palmitic, oleic, linolenic, linoleic and arachidonic acid residues) are treated with 2.8 g of a p-nitrophenylester of 3,4,5-trimethoxybenzoyl acid in an ethanolic solution (see Example 5). The same procedure as described in Example 5 is then followed, excluding the wash of the organic solution with Na₂ CO₃. The residue is purified by chromatography, yield 4.5 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (70:30:5), indicates that it is a single compound with an Rf of 0.5.

EXAMPLE 12 Product 12

Nicotinylphosphatidylserine amide of the formula ##STR24## 5 g of phosphatidylserine (taken from the phospholipids present in the bovine brain and in which the groups R and R' are mainly stearic, palmitic. oleic, linolenic, linoleic and arachidonic acid residues) are treated with 2 g of a p-nitrophenylester of nicotinic acid in an ethanolic solution (see Example 7).

The same procedure as described in Example 5 is then followed, excluding the wash of the organic solution with Na₂ CO₃. The residue is purified by chromatography, yield 5.1 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (70:35:5), indicates that it is a single compound with an Rf of 0.5.

EXAMPLE 13 Product 13

3,4,5-Trimethoxybenzoyllisophosphatidylserine amide of the formula ##STR25## 5 g of lisophosphatidylerine (taken from the enzymatic hydrolysis of phosphatidylserine, the R group in the lisophosphatidylserine being mainly stearic or oleic acid) are treated with 4.3 g of a p-nitrophenylester of 3,4,5-trimethoxybenzoyl acid in an ethanolic solution (see Example 5). The same procedure as described in Example 5 is then followed, excluding the wash of the organic solution with Na₂ CO₃. The residue is purified by chromatography, yield 6.0 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:water (60:35:8), indicates that it is a single compound with an Rf of 0.3.

EXAMPLE 14 Product 14

3,4,5-Trimethoxybenzoylphosphatidylethanolamine amide of the formula ##STR26## 5 g of phosphatidylethanolamine (taken from the phospholipids present in the bovine brain and in which the groups R and R' are mainly oleic, stearic, palmitic, linoleic and arachidonic acid residues) are treated with 3 g of a p-nitrophenylester of 3,4,5-trimethoxybenzoyl acid in an ethanolic solution (see Example 5). The same procedure as described in Example 5 is then followed. The residue is purified by chromatography, yield 5.1 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by methylene chlorine:ethyl acetate:methanol (70:30:20), indicates that it is a single compound with an Rf of 0.30.

EXAMPLE 15 Product 15

Dihydrolysergyldihydrosphingosine amide of the formula ##STR27##

The procedure is carried out as described in Example 3, beginning with 2.5 g of dihydrosphingosine (obtained through the catalytic hydrogenation of the sphingosine C₁₈); 2.24 g of dihydrolysergic acid; 2.24 g of 1-hydroxybenzotriazole; and 2.06 g of dicyclohexyl-carbodiimide. The reaction takes place in chloroform (130 ml). The compound crystallizes from acetone, M.P. 200° C., yield 3.6 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:ammonia 1N (64:24:3.2), indicates that it is a single compound with an Rf of 0.69.

Evaluation of the specific rotary power is carried out in a 2% methanol solution using a 1 dm polarimetric tube. Results: (α)_(D) =-47.5°.

Elementary analysis gives the following results (%): C 73.61; H 10.22; N 7.45. For C₃₄ H₅₅ N₃ O₃ theoretical % calculated is--C 73.73; H 10.01; N 7.59.

EXAMPLE 16 Product 16

Dihydrolysergylpsychosine amide of the formula ##STR28##

The procedure is carried out as described in Example 3, beginning with 2.8 g of psychosine (obtained from the sphingolipids present in the bovine brain and containing a sphingosinic residue C₁₈); 1.62 g of dihydrolysergic acid; 1.62 g of 1-hydroxybenzotriazole; and 2.06 g of dicyclohexylcarbodiimide. The reaction takes place in a chloroform solution, 100 ml of chloroform. The compound crystallizes from ethyl acetate, M.P. 140° C., yield 3.8 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by chloroform:methanol:ammonia 1N (64:24:3.2), indicates that it is a single compound with an Rf of 0.43.

Evaluation of the specific rotary power is carried out in a 2% methanol solution using a 1 dm polarimetric tube. Results: (α)_(D) =-32°.

Elementary analysis gives the following results (%): C 67.01; H 8.62; N 5.48. For C₄₀ H₆₃ N₃ O₈, theoretical % calculated is--C 67.29; H 8.89; N 5.89.

EXAMPLE 17 Products 17.1 and 17.2

Isolysergylpsychosine amide of the formula ##STR29## and lysergylpsychosine amide of the formula ##STR30##

The procedure is carried out at described in Example 2, beginning with 6.7 g of D-lysergic acid; 4.45 g of N-N'-carbonyldiimidazole; 12.7 g of psychosine (taken from sphingolipids present in the bovine brain and containing a sphingosinic residue C₁₈). The reaction takes place in a dimethylformamide solution of the same volume as described in Example 2. The residue is then chromatographically fractionated, separating the two compounds: Product 17.1 and Product 17.2.

a. Product 17.1--isolysergyl psychosine amide, M.P. 97°-100° C.

Chromatography on silica gel using an eluent mixture formed by chloroform:methanol:ammonia 1M (64:24:3.2), indicates that it is a single compound with Rf 0.76.

Evaluation of the specific rotary power is carried out in a 2% methanol solution using a 1 dm polarimetric tube. Results: (α)_(D) =+143°.

Elementary analysis gives the following results (%): C 67.35; H 8.51; N 5.65. For C₄₀ H₆₁ N₃ O₈ theoretical % calculated is--C 67.48; H 8.64; N 5.90.

b. Product 17.2--lysergylpsychosine amide, M.P. 122°-126° C.

Chromatography on silica gel using an eluent mixture formed by chloroform:methanol:ammonia 1M (64:24:3.2), indicates that it is a single compound with an Rf of 0.59.

Evaluation of the specific rotary power is carried out in a 2% methanol solution using a 1 dm polarimetric tube. Results: (α)_(D) =+2°.

Elementary analysis gives the following results (%): C 67.40; H 8.56; N 5.71. For C₄₀ H₆₁ N₃ O₈ theoretical % calculated is--C 67.48; H 8.64; N 5.90.

EXAMPLE 18 Product 18

Isonicotinylsphingosine amide of the formula ##STR31## 5 g of sphingosine (taken from the sphingolipids present in the bovine brain and corresponding to a sphingosine C₁₈) are treated with 500 ml absolute ethanol. To the solution, 5.5 g of the p-nitrophenylester of isonicotinic acid (prepared according to: C.A. 59, 8708b (1963)) is added. The same procedure as described in Example 5 is then followed. The residue crystallizes from acetonitrile, M.P. 116° C., yield 6.0 g.

Thin layer chromatography (silica gel) using an eluent mixture formed by methylene chloride:ethyl acetate:methanol (70:30:15), indicates that it is a single compound with an Rf of 0.49.

Elementary analysis gives the following results (%): C 71.12; H 9.78; N 6.70. For C₂₄ H₄₀ N₂ O₃ theoretical % calculated is--C 71.24; H 9.97; N 6.92.

PHARMACOLOGICAL PROPERTIES

The compounds described above in Examples 1, 2, 3, 15 and 16 were tested for pharmacological activity. These compounds were tested both in vitro and in vivo in laboratory animals and proved to be capable of acting directly on the central nervous system.

Product 1 from Example 1--Gamma-aminobutyrylsphingosine amide

a. in vitro tests:

Gamma-aminobutyric acid (GABA), NH₂ (CH₃)₃ --CO₂ H, is an endogenous substance and is biologically active due to interaction with a specific receptor but is incapable, by itself, of penetrating the encephalic barrier. Accordingly, GABA has been found to be active in vitro but relatively inactive in vivo. The compounds of the present invention, on the other hand, are active both in vitro and in vivo. To show this activity of the compounds of the present invention, in vitro tests measuring the binding levels of radioactive gamma-aminobutyric acid, ³ H--GABA, on synaptic membranes of the rat cortex were carried out according to the method of Enna and Snyder (Enna, S. J. and Snyder, S. H., Mol. Pharmacol. 13, 442-45300 (1977)).

Table I presents the results of these tests, expressed in percentage of the fixed active product, comparing the in vitro activity of Product 1 with the activities of the individual components which comprise Product 1. The results show that sphingosine alone exhibits no biological activity while GABA alone exhibits activity comparable to that of Product 1.

                  TABLE I                                                          ______________________________________                                         Product 1                                                                      Binding on rat cortex membranes                                                                         Product bound                                         Product utiized          %                                                     ______________________________________                                         .sup.3 H--GABA 2.10.sup.-8 M     100                                           .sup.3 H--GABA 2.10.sup.-8 M                                                                +     GABA 10.sup.-8 M                                                                             90                                                         +     GABA 10.sup.-7 M                                                                             45                                                         +     GABA 10.sup.-6 M                                                                             25                                                         +     GABA 10.sup.-5 M                                                                             20                                                         +     GABA 10.sup.-4 M                                                                             20                                            .sup.3 H--GABA 2.10.sup.-8 M                                                                +     sphingosine 10.sup.-8 M                                                                      100                                                        +     sphingosine 10.sup.-7 M                                                                      100                                                        +     sphingosine 10.sup.-6 M                                                                      100                                                        +     sphingosine 10.sup.-5 M                                                                      100                                                        +     sphingosine 10.sup.-4 M                                                                      100                                           .sup.3 H--GABA 2.10.sup.-8 M                                                                +     product 1 10.sup.-8 M                                                                        95                                                         +     product 1 10.sup.-7 M                                                                        60                                                         +     product 1 10.sup.-6 M                                                                        40                                                         +     product 1 10.sup.-5 M                                                                        25                                                         +     product 1 10.sup.-4 M                                                                        20                                            ______________________________________                                    

b. in vivo tests:

The in vivo activity of Product 1 was measured by the method described by Costa et al (E. Costa, A. Guidotti and C. C. Mao; "Evidence for involvement of GABA in the Action of Benzodiazepines: Studies in Rat Cerebellum" in Mechanism of Action of Benzodiazepines; Ed. by E. Costa and P. Greengard, New York, Raven Press. pp. 113-130 (1975)) and by Loescher and Frey (Loesher, W. and Frey, H. H.; "Effect of convulsant and anticonvulsant agents on level and metabolism of gamma-aminobutyric acid in mouse brain"; Naunyn-Schmiedeberg's Arch. Pharmacol. 296, 263-269 (1977)). These tests are based on the known activity of isoniazide to cause convulsions and a lowering of the GABA cerebral levels and the glutamic-decarboxylase enzyme activity. According to the test method, isoniazide is administered to the control animals (rats) while isoniazide and the appropriate test compound are administered to the groups of test animals and the results are measured in terms of the number of animals exhibiting convulsions, the latency of convulsions and the number of deaths. The results are presented in Table II and show that Product 1 has for superior in vivo activity as compared to GABA or sphingosine alone.

                  TABLE II                                                         ______________________________________                                         Product 1                                                                      Anticonvulsivant effects in rat                                                               Isoniazide                                                                               Isoniazide                                                                               Isoniazide                                                 160 mg/kg 160 mg/kg 160 mg/kg                                                  (s.c.) ÷                                                                             (s.c.) +  (s.c.) +                                           Isoniazide                                                                             GABA      Sphingosine                                                                              Product 1                                          160 mg/kg                                                                              8 mg/kg   12 mg/kg  20 mg/kg                                           (s.c.)  (i.p.)    (i.p.)    (i.p.)                                      ______________________________________                                         Number of                                                                               26/30     24/30     20/30   9/30                                      animals in                                                                     convulsions                                                                    Latency  3070 ± 110                                                                            3100 ± 156                                                                            3700 ± 200                                                                          4500 ± 330                             of the                                                                         convulsions                                                                    measured in                                                                    seconds                                                                        Number of                                                                               15        14        9       3                                         dead ani-                                                                      mals                                                                           ______________________________________                                    

Product 3 of Example 3--Dihydrolysergylsphingosine amide

a. in vitro tests:

The in vitro biological activity was determined by comparative tests measuring the binding power of the labelled spiroperidole (³ H)-spiroperidole on hypophysis sinaptosomal rat membranes according to the method described by Greese et al (GREESE I., SCHNEIDER R. and SNYDER S. H.; H-spiroperidole labels dopamine receptors in pituitary and brain; Europ. J. Pharmacol. 46, 377-381 (1977)).

The results obtained and illustrated in Table III show that the binding power of Product 3 is significant and far superior, under the same experimental conditions, to that of dihydrolysergic acid or sphingosine alone.

                  TABLE III                                                        ______________________________________                                         Product 3                                                                      Binding to hypophysis membranes of rat                                         Product utilized       Product bound %                                         ______________________________________                                         (.sup.3 H) spiroperidole 2.10.sup.-9 M                                                                    100                                                 (Control)                                                                      (.sup.3 H) spiroperidole 2.10.sup.-9 M +                                                         10.sup.-7 M                                                                             100                                                 dihydrolysergic acid                                                                             10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             95                                                                    10.sup.-4 M                                                                             45                                                  (.sup.3 H) spiroperidole 2.10.sup.-9 M +                                                         10.sup.-7 M                                                                             100                                                 sphingosine       10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             100                                                                   10.sup.-4 M                                                                             100                                                 (.sup.3 H) spiroperidole 2.10.sup.-9 M +                                                         10.sup.-7 M                                                                             100                                                 Product 3         10.sup.-6 M                                                                             90                                                                    10.sup.-5 M                                                                             40                                                                    10.sup.-4 M                                                                             10                                                  ______________________________________                                    

b. in vivo tests:

The in vivo biological activity of Product 3 was measured by evaluating the serum levels of prolactin in hyperprolactinemic animals according to the RIA method (radioimmunoassay) and the instructions in the NIAMDD program. The results obtained and illustrated in Table IV, expressed as % of inhibition, show that Product 3 exhibits significant biological activity, especially as compared to the weak effect of dihydrolysergic acid.

                  TABLE IV                                                         ______________________________________                                         Product 3                                                                      Hypoprolactinemic effect in rats                                                                 Prolactin Inhibition                                         Product utilized  ng/ml     %                                                  ______________________________________                                         Control at the circadian                                                                         68.0 ± 5.4                                                                            0                                                  peak at 4 p.m.                                                                 Dihydrolysergic acid                                                           0.5 mg/kg         60.0 ± 3.2                                                                            0                                                  5.0 mg/kg         51.0 ± 6.7                                                                            25                                                 Sphingosine                                                                    0.5 mg/kg         71.0 ± 4.2                                                                            0                                                  5.0 mg/kg         62.0 ± 6.8                                                                            0                                                  Product 3                                                                      0.5 mg/kg         38.7 ± 4.7                                                                            42                                                 5.0 mg/kg         32.2 ± 5.7                                                                            52                                                 Control           77.0 ± 9.0                                                                            0                                                  Sulpiride 10 γ/kg                                                        Sulpiride + Dihydro-                                                           lysergic acid                                                                  0.5 mg/kg         66.0 ± 2.8                                                                            0                                                  5.0 mg/kg         65.0 ± 4.6                                                                            0                                                  Sulpiride + sphingosine                                                        0.5 mg/kg         72.0 ± 4.5                                                                            0                                                  5.0 mg/kg         77.0 ± 8.7                                                                            0                                                  Sulpiride + product 3                                                          0.5 mg/kg         53.7 ± 8.5                                                                            30                                                 5.0 mg/kg         31.2 ± 2.5                                                                            60                                                 ______________________________________                                    

Product 15 of Example 15--Dihydrolysergyldihydrosphingosine amide

The in vitro biological activity and in vivo activities of Product 15 were evaluated according to the same methods as used above for Product 3 of Example 3.

The results obtained and presented in Tables V and VI show in vitro and in vivo activities of Product 15 to be far superior to either dihydrolysergic acid or dihydrosphingosine alone.

                  TABLE V                                                          ______________________________________                                         Product 15                                                                     Binding to hypophysis membranes of rat                                         Product utilized      Product bound %                                          ______________________________________                                         (.sup.3 H) spiroperidole 2 nM                                                                            100                                                  (Control)                                                                      (.sup.3 H) spriroperidole 2 nM +                                                                10.sup.-7 M                                                                             100                                                  dihydrolysergic acid                                                                            10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             95                                                                    10.sup.-4 M                                                                             45                                                   (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  dihydrosphingosine                                                                              10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             100                                                                   10.sup.-4 M                                                                             100                                                  (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  Product 15       10.sup.-6 M                                                                             90                                                                    10.sup.-5 M                                                                             30                                                                    10.sup.-4 M                                                                             20                                                   ______________________________________                                    

                  TABLE VI                                                         ______________________________________                                         Product 15                                                                     Hypoprolactinemic effect in rat                                                                  Prolactin Inhibition                                         Product utilized  ng/ml     %                                                  ______________________________________                                         Control at the circadian                                                                         62.0 ± 3.8                                                                            0                                                  peak at 4 p.m.                                                                 Dihydrolysergic acid                                                           0.5 mg/kg         60.0 ± 4.1                                                                            0                                                  5.0 mg/kg         48.0 ± 5.1                                                                            23                                                 Dihydrosphingosine                                                             0.5 mg/kg         66.0 ± 4.2                                                                            0                                                  5.0 mg/kg         60.0 ± 2.8                                                                            0                                                  Product 15                                                                     0.5 mg/kg         40.0 ± 5.6                                                                            35                                                 5.0 mg/kg         31.0 ± 3.4                                                                            50                                                 Control           85.0 ± 9.0                                                                            0                                                  Sulpiride 10 γ/kg                                                        Sulpiride + Dihydro-                                                           lysergic acid                                                                  10 γ/kg + 0.5 mg/kg                                                                        77.0 ± 5.0                                                                            0                                                  10 γ/kg + 5.0 mg/kg                                                                        76.0 ± 8.0                                                                            0                                                  Sulpiride + dihydrosphin-                                                      gosine                                                                         10 γ/kg + 0.5 mg/kg                                                                         81.0 ± 11.0                                                                          0                                                  10 γ/kg + 5.0 mg/kg                                                                        74.0 ± 6.0                                                                            0                                                  Sulpiride + product 15                                                         10 γ/kg + 0.5 mg/kg                                                                        48.0 ± 4.0                                                                            44                                                 10 γ/kg + 5.0 mg/kg                                                                        39.0 ± 6.0                                                                            55                                                 ______________________________________                                    

Product 2.2 of Example 2--Lysergylsphingosine amide

The in vitro and in vivo biological activities of Product 2.2 were evaluated according to the same methods as described above for Product 3, Example 3.

The results obtained and presented in Tables VII and VIII show the in vitro and in vivo activities of Product 2.2 to be far superior to either lysergic acid or sphingosine alone.

                  TABLE VII                                                        ______________________________________                                         Product 2.2                                                                    Binding to hypophysis membranes of rats                                        Product utilized      Product bound %                                          ______________________________________                                         (.sup.3 H) spiroperidole 2 nM                                                                            100                                                  (Control)                                                                      (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  lysergic acid    10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             90                                                                    10.sup.-4 M                                                                             60                                                   (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  sphingosine      10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             100                                                                   10.sup.-4 M                                                                             100                                                  (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  product 2.2      10.sup.-6 M                                                                             85                                                                    10.sup.-5 M                                                                             55                                                                    10.sup.-4 M                                                                             35                                                   ______________________________________                                    

                  TABLE VIII                                                       ______________________________________                                         Product 2.2                                                                    Hypoprolactinemic effect in rats                                                                 Prolactin  Inhibition                                        Product utilized  ng/ml      %                                                 ______________________________________                                         Control at the circadian                                                                         65.0 ± 4.8                                                                             0                                                 peak at 4 p.m.                                                                 Lysergic acid                                                                  0.5 mg/kg         61.0 ± 3.8                                                                             0                                                 5.0 mg/kg         52.0 ± 6.2                                                                             20                                                Sphingosine                                                                    0.5 mg/kg         68.0 ± 6.0                                                                             0                                                 5.0 mg/kg         61.0 ± 8.0                                                                             0                                                 Product 2.2                                                                    0.5 mg/kg         48.0 ± 4.8                                                                             27                                                5.0 mg/kg         40.0 ± 2.6                                                                             39                                                Control           87.0 ± 8.7                                                                             0                                                 Sulpiride 10 γ/kg                                                        Sulpiride + Lysergic acid                                                      10 γ/kg + 0.5 mg/kg                                                                        76.0 ± 9.0                                                                             13                                                10 γ/kg + 5.0 mg/kg                                                                         73.0 ± 10.0                                                                           16                                                Sulpiride + Sphingosine                                                        10 γ/kg + 0.5 mg/kg                                                                         81.0 ± 11.0                                                                           0                                                 10 γ/kg + 5.0 mg/kg                                                                        74.0 ± 6.0                                                                             14                                                Sulpiride + product 2.2                                                        10 γ/kg + 0.5 mg/kg                                                                        59.0 ± 6.0                                                                             32                                                10 γ/kg + 5.0 mg/kg                                                                        49.0 ± 5.0                                                                             44                                                ______________________________________                                    

Product 16 of Example 16--Dihydrolisergylpsychosine amide

The in vitro and in vivo biological activities of Product 16 were evaluated according to the same methods as described for Product 3, Example 3.

The results obtained and presented in Tables IX and X show the in vitro and in vivo activities of Product 16 to be far superior to either dihydrolysergic acid or psychosine alone.

                  TABLE IX                                                         ______________________________________                                         Product 16                                                                     Binding to hypophysis membranes of rats                                        Product utilized      Product bound %                                          ______________________________________                                         (.sup.3 H) spiroperidole 2 nM                                                                            100                                                  (Control)                                                                      (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  dihydrolysergic acid                                                                            10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             90                                                                    10.sup.-4 M                                                                             60                                                   (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  psychosine       10.sup.-6 M                                                                             100                                                                   10.sup.-5 M                                                                             90                                                                    10.sup.-4 M                                                                             60                                                   (.sup.3 H) spiroperidole 2 nM +                                                                 10.sup.-7 M                                                                             100                                                  product 16       10.sup.-6 M                                                                             80                                                                    10.sup.-5 M                                                                             45                                                                    10.sup.-4 M                                                                             25                                                   ______________________________________                                    

                  TABLE X                                                          ______________________________________                                         Product 16                                                                     Hypoprolactinemic effect in rats                                                                 Prolactin Inhibition                                         Product utilized  ng/ml     %                                                  ______________________________________                                         Control at the circadian                                                                         58.0 ± 6.0                                                                            0                                                  peak at 4 p.m.                                                                 Dihydrolysergic acid                                                           0.5 mg/kg         57.0 ± 5.0                                                                            0                                                  5.0 mg/kg         49.0 ± 6.0                                                                            16                                                 Psychosine                                                                     0.5 mg/kg         50.0 ± 5.0                                                                            14                                                 5.0 mg/kg         41.0 ± 5.0                                                                            30                                                 Product 16                                                                     0.5 mg/kg         40.0 ± 7.0                                                                            31                                                 5.0 mg/kg         31.0 ± 6.0                                                                            47                                                 Control           81.0 ± 9.0                                                                            0                                                  Sulpiride 10 γ/kg                                                        Sulpiride + Dihydro-                                                           lysergic acid                                                                  10 γ/kg + 0.5 mg/kg                                                                        77.0 ± 6.0                                                                            0                                                  10 γ/kg + 5.0 mg/kg                                                                        70.0 ± 4.0                                                                            14                                                 Sulpiride + psychosine                                                         10 γ/kg + 0.5 mg/kg                                                                        70.0 ± 6.0                                                                            14                                                 10 γ/kg + 5.0 mg/kg                                                                        61.0 ± 7.0                                                                            25                                                 Sulpiride + product 16                                                         10 γ/kg + 0.5 mg/kg                                                                        51.0 ± 7.0                                                                            37                                                 10 γ/kg + 5.0 mg/kg                                                                        39.0 ± 4.0                                                                            52                                                 ______________________________________                                    

THERAPEUTIC USES

According to the present invention, the organic amides derived from nitrogenous lipids can be used as medicaments for various therapeutic uses, in particular for those uses corresponding to the activities of the active acids from which the amides are prepared. For example, derivatives of lysergic, isolysergic, dihydrolysergic, 2-bromo-lysergic, 2-bromo-dihydrolysergic, 1-methyl-lysergic, 1-methyl-dihydrolysergic, 1-methyl-2-bromo-lysergic, 1-methyl-2-bromo-dihydrolysergic, gamma-amino-butyric, valproic, trimethoxybenzoic and nicotinic acid are suitable for use as medicaments capable of exhibiting pharmacological activity on the central nervous system (CNS). The derivatives of lysergic acid, 2-bromo-lysergic, 1-methyl-lysergic and 1-methyl-2-bromo-lysergic also exert a significant activity on the uterus. Specifically, the compounds of the present invention which are experimentally active against isoniazid convulsions and on the binding of GABA in vitro, and the pharmaceutical compositions containing them, may be therapeutically useful in pathologies connected with changes in the function of the GABAurgic system, since these products are able to enhance levels of GABA in the central nervous system (CNS) and in the specific cerebral areas, thereby enabling the GABA, bound to natural amino-alcohols, to penetrate the blood-brain barrier. To be more precise, these compounds and the pharmaceutical preparations containing them may be usefully employed in the prevention of convulsive states which usually give rise to tonoclonic contractions and/or loss of consciousness, as in epilepsy; that is, in focal epilepsy, in psychomotorial epilepsy, in major epilepsy, in idiopathic epilepsy, in status epilipticus and in centroencaphalic epilepsy (in minor epilepsy, akinetic attacks, mioclonic epilepsy) and in general, in pathologies deriving from decrease of inhibitory control in the CNS.

The compounds which have proved to be active in inhibiting the serum levels of prolactin and in the binding in vitro of the dopaminergic ligand in the hypophysis, and the pharmaceutical compositions deriving from them, as exemplified in the in vivo and in vitro data noted above, may be usefully employed in pathologies which present alterations in the release of neuropeptides from hypophysis as prolactin due to changes in the regulation of the neurotransmittor systems with loss of dopaminergic system tonic inhibition or, in general, of the hypothalamic routes as in hyperprolactinemias caused by neuroleptics such as sulpiride, chlorpromazine, etc.

Thus, the drugs deriving from the compounds of the present invention may be used in the treatment of behavioral alterations resulting from modifications of neuropeptide hormones from hypophysis as hyperprolactinemic syndromes with loss of lipids and impotence, and hypopituitarism with changes in personality, apathy, indifference, astenia, loss of libido and confusion, and premenstrual syndromes with depression and changes of mood and climacteric syndromes and variations in mood, irritability, anxiety, nervousness and depression.

The compounds of the present invention can be administered as pharmaceutical compositions containing, as an active ingredient, one or more of the amides in association with one or more compatible and pharmaceutically acceptable excipients. The compositions can be administered via various administration routes, such as injectable solutions, tablets, gelatine capsules and suppositories. The dosage administered will vary depending on the desired effect and administration route, but, for example, in oral administration the dosages can be between 10 and 300 mg of active substance per day with a single dosage of from 10 to 100 mg.

The following are examples of pharmaceutical compositions for oral administration:

a. Pharmaceutical preparation 1:

10 mg tablets

Each tablet contains:

    ______________________________________                                         Active substance        10     mg                                              Microcrystalline cellulose                                                                             100    mg                                              Lactose                 150    mg                                              Magnesium stearate      2.5    mg                                              Starch                  20     mg                                              ______________________________________                                    

b. Pharmaceutical preparation 2:

50 mg tablets

Each tablet contains:

    ______________________________________                                         Active substance        50     mg                                              Microcrystalline cellulose                                                                             100    mg                                              Lactose                 110    mg                                              Magnesium stearate      2.5    mg                                              Starch                  20     mg                                              ______________________________________                                    

c. Pharmaceutical preparation 3:

100 mg tablets

Each tablet contains:

    ______________________________________                                         Active substance        100    mg                                              Microcrystalline cellulose                                                                             100    mg                                              Lactose                 2.5    mg                                              Magnesium stearate      3.5    mg                                              Starch                  25     mg                                              ______________________________________                                    

d. Pharmaceutical preparation 4:

10 mg gelatin capsule

Each capsule contains:

    ______________________________________                                         Active substance      10     mg                                                Vegetable oil         100    mg                                                Gelatine              100    mg                                                Glycerine             25     mg                                                ______________________________________                                    

e. Pharmaceutical preparation 5:

50 mg gelatine capsule

Each capsule contains:

    ______________________________________                                         Active substance      50     mg                                                Vegetable oil         120    mg                                                Gelatine              110    mg                                                Gycerine              30     mg                                                ______________________________________                                    

f. Pharmaceutical preparation 6:

100 mg gelatine capsule

Each capsule contains:

    ______________________________________                                         Active substance      100    mg                                                Vegetable oil         150    mg                                                Gelatine              130    mg                                                Gycerine              44     mg                                                ______________________________________                                     

We claim:
 1. An organic amide compound of the formula: ##STR32## wherein R₁ --CO is an acyl residue of a pyridine carboxylic acid selected from the group consisting of picolinic acid, nicotinic acid and isonicotinic acid or trimethoxybenzoic acid, R₂ is a hydrogen atom and R₃ is a residue of a phospholipid having the chemical structure: ##STR33## wherein R and R' each represent a hydrogen atom or an acyl residue of a member selected from the group consisting of stearic, palmitic, oleic, linolenic, linoleic and arachidonic acid, or a pharmaceutically acceptable salt thereof.
 2. An organic amide compound of the formula: ##STR34## wherein R₁ --CO is an acyl residue of a pyridine carboxylic acid selected from the group consisting of picolinic acid, nicotinic acid and isonicotinic acid or trimethoxybenzoic acid, R₂ is a hydrogen atom and R₃ is a residue of a phopholipid having the chemical structure: ##STR35## wherein R and R' each represent a hydrogen atom or an acyl residue of a member selected from the group consisting of stearic, palmitic, oleic, linolenic, linoleic and arachidonic acid, or a pharmaceutically acceptable salt thereof.
 3. An organic amide compound of the formula: ##STR36## wherein R₁ --CO is an acyl residue of a pyridine carboxylic acid selected from the group consisting of picolinic acid, nicotinic acid and isonicotinic acid or trimethoxybenzoic acid, R₂ is a hydrogen atom and R₃ is a residue of a sphingolipid having a chemical structure selected from the group consisting of: ##STR37## wherein n is from 6 to 16, ##STR38## wherein n is from 8 to 18, ##STR39## wherein n is from 6 to 16, ##STR40## wherein n is from 8 to 18, ##STR41## wherein n is from 6 to 16, ##STR42## wherein n is from 8 to 18, and ##STR43## wherein n is from 11 to 15, or a pharmaceutically acceptable salt thereof.
 4. An organic amide compound according to claim 3, wherein said term R₃ represent the residue of a sphingolipid having the chemical structure: ##STR44## wherein n is from 6 to
 16. 5. An organic amide compound according to claim 3, wherein said term R₃ represents the residue of a sphingolipid having the chemical structure: ##STR45## wherein n is from 8 to
 18. 6. An organic amide compound according to claim 3, wherein said term R₃ represents the residue of a sphingolipid having the chemical structure: ##STR46## wherein n is from 6 to
 16. 7. An organic amide compound according to claim 3, wherein said term R₃ represents the residue of a sphingolipid having the chemical structure: ##STR47## wherein n is from 8 to
 18. 8. An organic amide compound according to claim 3, wherein said term R₃ represents the residue of a sphingolipid having the chemical structure: ##STR48## wherein n is from 6 to
 16. 9. An organic amide compound according to claim 3, wherein said term represents the residue of a sphingolipid having the chemical structure: ##STR49## wherein n is from 8 to
 18. 10. An organic amide compound according to claim 3, wherein said term R₃ represents the residue of a sphingolipid having the chemical structure: ##STR50## wherein n is from 11 to
 15. 11. An organic amide compound according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10, wherein R₁ --CO is an acyl residue of a pyridine carboxylic acid selected from the group consisting of nicotinic, isonicotinic and picolinic acid.
 12. A pharmaceutical composition useful for treating disorders of the central ad peripheral nervous systems comprising an effective amount of an organic amide compound according to claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11, or a pharmaceutically acceptable salt thereof, in combination with a pharmaceutically acceptable carrier or diluent.
 13. A pharmaceutical composition according to claim 12, wherein said composition is in oral dosage form containing from 10 to 100 mg. of said organic amide compound. 